self-sufficient horcruxes

To guarantee the ability to recreate the original file from the horcruxes in the event that this repo would become lost there should be an option for the tool to return binary horcruxes that when executed run the horcrux program. Think like self extracting zip files in exe format.

So I can execute `./horcrux1 bind horcrux2 horcrux3` and recover the original file.

Start by tracing the existing horcrux executable entry point and the bind command described in the issue. Define how a generated binary can carry its horcrux data and invoke the program, then verify that executing it with the other horcruxes recovers the original file.

Written by the indexing model from the issue text.